Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity

HUO Shu-fen; XIAO Jing-lin

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Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity

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- Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity
- Chinese Journal of Luminescence Vol. 29, Issue 2, Pages: 225-228(2008)
- 作者机构：
  
  1. 内蒙古民族大学, 物理与电子信息学院,内蒙古通辽,028043
  2. 河北科技师范学院, 数理系,河北秦皇岛,066004
- 作者简介：
- 基金信息：
- DOI：
  CLC： O472.4;O469
- Received：12 July 2007，
  
  Revised：06 November 2007，
  
  Published：20 March 2008
- 稿件说明：
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霍淑芬, 肖景林. 磁场对含杂质的介观结构中持续电流的影响[J]. 发光学报, 2008,29(2): 225-228

HUO Shu-fen, XIAO Jing-lin. Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity[J]. Chinese Journal of Luminescence, 2008,29(2): 225-228
霍淑芬, 肖景林. 磁场对含杂质的介观结构中持续电流的影响[J]. 发光学报, 2008,29(2): 225-228 DOI：

HUO Shu-fen, XIAO Jing-lin. Effect of Magnetic Field on Persistent Currents in Mesoscopic Structure with an Impurity[J]. Chinese Journal of Luminescence, 2008,29(2): 225-228 DOI：

摘要

采用量子波导理论

研究了含杂质的介观结构中电子的透射几率和持续电流。结果表明:电子的透射几率及持续电流均随磁通量的变化作周期性振荡

周期大小是1;无论是否存在杂质

反共振(

=0)均出现在ƒ=0.5的位置(当0≤ƒ

1)。当两电子库间电流发生反转时

双Aharonov-Bohm环各环中的持续电流的大小均发生明显改变。

Abstract

Recent developments of fabrication techniques have made available structure whose dimensions are much smaller than the characteristic length

such as mean free path and phase-coherence length of an electron. These structures are referred to as mesoscopic system. The physical properties of the mesoscopic system are strongly affected by quantum-interference effects

and one of the interesting phenomena is the persistent current in a ring threaded by magnetic flux. The purpose of this paper is to reveal the behavior of the persistent currents of mesoscopic structure with an impurity by the quantum waveguide theory. It is found that both the transmission coefficient of electron and persistent currents oscillate periodically with changing of magnetic flux with a period of ƒ=1. In the region of 0≤ƒ<1

the antiresonance occurs at ƒ=0.5. When the flowing direction of the current reverses

the amplitude of persistent current in each ring of the double Aharonov-Bohm rings changes.

关键词

Keywords

references

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College of Physics and Electromechanics, Inner Mongolia National University, Tongliao 028043, China

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